Multiply or divide and leave the answer in trigonometric notation.7(cos 39° + i sin 39°) ? 3(cos 16° + i sin 16°)

A. 10(cos 55° + i sin 55°)
B. 10(cos 264° + i sin 264°)
C. 21(cos 55° + i sin 55°)
D. 21(cos 23° + i sin 23°)


Answer: C

Mathematics

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Write a chain rule formula for the following derivative. for w = f(x, y, z); x = g(r, s, t), y = h(r, s, t), z = k(r, s, t)

A.  =   +  
B.  =   +   +  
C.  =   +   +  
D.  =  +  + 

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Calculate the derivative of the function. Then find the value of the derivative as specified.t =1 if r = 

A.  = - t =1
 = - 
B.  = t =1
 = 
C.  = - t =1
 = - 
D.  = t =1
 = 

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Find the mode or modes.The table shows the country represented by the winner of the 10,000 meter run at a certain international competition in various years.YearCountry2001F2002F2003F2004F2005  P2006F2007C2008C2009R2010R2011U2012K2013F2014F2015E2016I2017M2018MFind the mode of the country data.

A. M B. F C. R D. C

Mathematics

Solve the equation.7x = 12

A.
B.
C.
D.

Mathematics